Fix build warnings.
[openssl.git] / crypto / x509v3 / v3_ncons.c
index 5fded6910ea525cb07ebffeecb10e3be60b8bd0c..9a99cb2fa094455dabde146095c194f908a65c57 100644 (file)
@@ -72,7 +72,14 @@ static int do_i2r_name_constraints(X509V3_EXT_METHOD *method,
                                        BIO *bp, int ind, char *name);
 static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip);
 
-X509V3_EXT_METHOD v3_name_constraints = {
+static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc);
+static int nc_match_single(GENERAL_NAME *sub, GENERAL_NAME *gen);
+static int nc_dn(X509_NAME *sub, X509_NAME *nm);
+static int nc_dns(ASN1_IA5STRING *sub, ASN1_IA5STRING *dns);
+static int nc_email(ASN1_IA5STRING *sub, ASN1_IA5STRING *eml);
+static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base);
+
+const X509V3_EXT_METHOD v3_name_constraints = {
        NID_name_constraints, 0,
        ASN1_ITEM_ref(NAME_CONSTRAINTS),
        0,0,0,0,
@@ -218,3 +225,277 @@ static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip)
        return 1;
        }
 
+/* Check a certificate conforms to a specified set of constraints.
+ * Return values:
+ *  X509_V_OK: All constraints obeyed.
+ *  X509_V_ERR_PERMITTED_VIOLATION: Permitted subtree violation.
+ *  X509_V_ERR_EXCLUDED_VIOLATION: Excluded subtree violation.
+ *  X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type.
+ *  X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE:  Unsupported constraint type.
+ *  X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: bad unsupported constraint syntax.
+ *  X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: bad or unsupported syntax of name
+
+ */
+
+int NAME_CONSTRAINTS_check(X509 *x, NAME_CONSTRAINTS *nc)
+       {
+       int r, i;
+       X509_NAME *nm;
+
+       nm = X509_get_subject_name(x);
+
+       if (X509_NAME_entry_count(nm) > 0)
+               {
+               GENERAL_NAME gntmp;
+               gntmp.type = GEN_DIRNAME;
+               gntmp.d.directoryName = nm;
+
+               r = nc_match(&gntmp, nc);
+
+               if (r != X509_V_OK)
+                       return r;
+
+               gntmp.type = GEN_EMAIL;
+
+
+               /* Process any email address attributes in subject name */
+
+               for (i = -1;;)
+                       {
+                       X509_NAME_ENTRY *ne;
+                       i = X509_NAME_get_index_by_NID(nm,
+                                                      NID_pkcs9_emailAddress,
+                                                      i);
+                       if (i == -1)
+                               break;
+                       ne = X509_NAME_get_entry(nm, i);
+                       gntmp.d.rfc822Name = X509_NAME_ENTRY_get_data(ne);
+                       if (gntmp.d.rfc822Name->type != V_ASN1_IA5STRING)
+                               return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
+
+                       r = nc_match(&gntmp, nc);
+
+                       if (r != X509_V_OK)
+                               return r;
+                       }
+               
+               }
+
+       for (i = 0; i < sk_GENERAL_NAME_num(x->altname); i++)
+               {
+               GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, i);
+               r = nc_match(gen, nc);
+               if (r != X509_V_OK)
+                       return r;
+               }
+
+       return X509_V_OK;
+
+       }
+
+static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc)
+       {
+       GENERAL_SUBTREE *sub;
+       int i, r, match = 0;
+
+       /* Permitted subtrees: if any subtrees exist of matching the type
+        * at least one subtree must match.
+        */
+
+       for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees); i++)
+               {
+               sub = sk_GENERAL_SUBTREE_value(nc->permittedSubtrees, i);
+               if (gen->type != sub->base->type)
+                       continue;
+               if (sub->minimum || sub->maximum)
+                       return X509_V_ERR_SUBTREE_MINMAX;
+               /* If we already have a match don't bother trying any more */
+               if (match == 2)
+                       continue;
+               if (match == 0)
+                       match = 1;
+               r = nc_match_single(gen, sub->base);
+               if (r == X509_V_OK)
+                       match = 2;
+               else if (r != X509_V_ERR_PERMITTED_VIOLATION)
+                       return r;
+               }
+
+       if (match == 1)
+               return X509_V_ERR_PERMITTED_VIOLATION;
+
+       /* Excluded subtrees: must not match any of these */
+
+       for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->excludedSubtrees); i++)
+               {
+               sub = sk_GENERAL_SUBTREE_value(nc->excludedSubtrees, i);
+               if (gen->type != sub->base->type)
+                       continue;
+               if (sub->minimum || sub->maximum)
+                       return X509_V_ERR_SUBTREE_MINMAX;
+
+               r = nc_match_single(gen, sub->base);
+               if (r == X509_V_OK)
+                       return X509_V_ERR_EXCLUDED_VIOLATION;
+               else if (r != X509_V_ERR_PERMITTED_VIOLATION)
+                       return r;
+
+               }
+
+       return X509_V_OK;
+
+       }
+
+static int nc_match_single(GENERAL_NAME *gen, GENERAL_NAME *base)
+       {
+       switch(base->type)
+               {
+               case GEN_DIRNAME:
+               return nc_dn(gen->d.directoryName, base->d.directoryName);
+
+               case GEN_DNS:
+               return nc_dns(gen->d.dNSName, base->d.dNSName);
+
+               case GEN_EMAIL:
+               return nc_email(gen->d.rfc822Name, base->d.rfc822Name);
+
+               case GEN_URI:
+               return nc_uri(gen->d.uniformResourceIdentifier,
+                                       base->d.uniformResourceIdentifier);
+
+               default:
+               return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE;
+               }
+
+       }
+
+/* directoryName name constraint matching.
+ * The canonical encoding of X509_NAME makes this comparison easy. It is
+ * matched if the subtree is a subset of the name.
+ */
+
+static int nc_dn(X509_NAME *nm, X509_NAME *base)
+       {
+       if (base->canon_enclen > nm->canon_enclen)
+               return X509_V_ERR_PERMITTED_VIOLATION;
+       if (memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen))
+               return X509_V_ERR_PERMITTED_VIOLATION;
+       return X509_V_OK;
+       }
+
+static int nc_dns(ASN1_IA5STRING *dns, ASN1_IA5STRING *base)
+       {
+       char *baseptr = (char *)base->data;
+       char *dnsptr = (char *)dns->data;
+       /* Empty matches everything */
+       if (!*baseptr)
+               return X509_V_OK;
+       /* Otherwise can add zero or more components on the left so
+        * compare RHS and if dns is longer and expect '.' as preceding
+        * character.
+        */
+       if (dns->length > base->length)
+               {
+               dnsptr += dns->length - base->length;
+               if (dnsptr[-1] != '.')
+                       return X509_V_ERR_PERMITTED_VIOLATION;
+               }
+
+       if (strcasecmp(baseptr, dnsptr))
+                       return X509_V_ERR_PERMITTED_VIOLATION;
+
+       return X509_V_OK;
+
+       }
+
+static int nc_email(ASN1_IA5STRING *eml, ASN1_IA5STRING *base)
+       {
+       const char *baseptr = (char *)base->data;
+       const char *emlptr = (char *)eml->data;
+
+       const char *baseat = strchr(baseptr, '@');
+       const char *emlat = strchr(emlptr, '@');
+       if (!emlat)
+               return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
+       /* Special case: inital '.' is RHS match */
+       if (!baseat && (*baseptr == '.'))
+               {
+               if (eml->length > base->length)
+                       {
+                       emlptr += eml->length - base->length;
+                       if (!strcasecmp(baseptr, emlptr))
+                               return X509_V_OK;
+                       }
+               return X509_V_ERR_PERMITTED_VIOLATION;
+               }
+
+       /* If we have anything before '@' match local part */
+
+       if (baseat)
+               {
+               if (baseat != baseptr)
+                       {
+                       if ((baseat - baseptr) != (emlat - emlptr))
+                               return X509_V_ERR_PERMITTED_VIOLATION;
+                       /* Case sensitive match of local part */
+                       if (strncmp(baseptr, emlptr, emlat - emlptr))
+                               return X509_V_ERR_PERMITTED_VIOLATION;
+                       }
+               /* Position base after '@' */
+               baseptr = baseat + 1;
+               }
+       emlptr = emlat + 1;
+       /* Just have hostname left to match: case insensitive */
+       if (strcasecmp(baseptr, emlptr))
+               return X509_V_ERR_PERMITTED_VIOLATION;
+
+       return X509_V_OK;
+
+       }
+
+static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base)
+       {
+       const char *baseptr = (char *)base->data;
+       const char *hostptr = (char *)uri->data;
+       const char *p = strchr(hostptr, ':');
+       int hostlen;
+       /* Check for foo:// and skip past it */
+       if (!p || (p[1] != '/') || (p[2] != '/'))
+               return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
+       hostptr = p + 3;
+
+       /* Determine length of hostname part of URI */
+
+       /* Look for a port indicator as end of hostname first */
+
+       p = strchr(hostptr, ':');
+       /* Otherwise look for trailing slash */
+       if (!p)
+               p = strchr(hostptr, '/');
+
+       if (!p)
+               hostlen = strlen(hostptr);
+       else
+               hostlen = p - hostptr;
+
+       if (hostlen == 0)
+               return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX;
+
+       /* Special case: inital '.' is RHS match */
+       if (*baseptr == '.')
+               {
+               if (hostlen > base->length)
+                       {
+                       p = hostptr + hostlen - base->length;
+                       if (!strncasecmp(p, baseptr, base->length))
+                               return X509_V_OK;
+                       }
+               return X509_V_ERR_PERMITTED_VIOLATION;
+               }
+
+       if ((base->length != (int)hostlen) || strncasecmp(hostptr, baseptr, hostlen))
+               return X509_V_ERR_PERMITTED_VIOLATION;
+
+       return X509_V_OK;
+
+       }